NimbocastO'Fallon, IL Weather
Live radar, hourly and 7-day forecast, and National Weather Service alerts for O'Fallon, Saint Clair County, Illinois.
Updated Jul 29, 2026, 2:17 PM local time · Radar refreshes every 5 minutes
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O'Fallon
87°F
Wind 7 mph
Humidity 47%
Cloud cover 0%
UV index 8
Alerts 0
Active alerts
✓
No active National Weather Service alerts for O'Fallon, IL.
O'Fallon weather radar
Light
Heavy
Next 24 hours
Now
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86°F
3 PM
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88°F
4 PM
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88°F
5 PM
☀️
87°F
6 PM
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87°F
7 PM
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85°F
8 PM
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82°F
9 PM
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79°F
10 PM
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76°F
11 PM
☀️
74°F
12 AM
☀️
73°F
1 AM
☀️
71°F
2 AM
☀️
70°F
3 AM
☀️
69°F
4 AM
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67°F
5 AM
☀️
66°F
6 AM
☀️
65°F
7 AM
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67°F
8 AM
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71°F
9 AM
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76°F
10 AM
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80°F
11 AM
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84°F
12 PM
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86°F
1 PM
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88°F
7-day forecast
Today
Jul 29
☀️
88°F
68°F
Thu
Jul 30
☁️
90°F
65°F
Fri
Jul 31
🌧️
80°F
68°F
72%
Sat
Aug 1
🌦️
74°F
66°F
72%
Sun
Aug 2
☁️
79°F
63°F
16%
Mon
Aug 3
☀️
81°F
61°F
15%
Tue
Aug 4
☁️
84°F
63°F
15%
Weather near O'Fallon
4 mi
Fairview Heights, IL6 mi
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Alerts are relayed from the National Weather Service and may lag
the official source. In a life-threatening situation always follow
weather.gov and local emergency
broadcasts.